1. A Short DOS Presentation
Review

2. PCs before Windows DOS Text based operating system
Disk Operating System
Text based operating system
No mice allowed!

3. DOS 101 Documents are stored in files Files are stored in directories
In the Windows & Mac worlds, these are called "Folders"
Directories are stored on disks
Usually denoted with an upper case letter, followed by a colon A: B: C:

4. Getting to DOS

5. The DOS Window

6. Before we get started, here are two useful commands
While in DOS, this key will allow you to repeat the last action
doskey
This DOS function remembers all your commands
You use the up & down arrow keys to access them

7. Getting to doskey

8. Clearing the screen

9. Getting to the Floppy drive

10. Looking Around Short File Name Long File Name Size Date/Time
Disk Information

11. Compiling & Running Java

12. Program Development Integrated Development Environment
Many tools available
Writing, compile, debugging source code
“friendly”
Can be expensive
Command-line tool
Java Development Kit
Free!!
Look for most recent version

13. Edit
You can use either a Java IDE, or Windows notepad to develop your code

15. javac myClassName.java
Compile
We use DOS and the Java compiler to create bytecode that can be interpreted
The command to compile the program
There are, of course, many variations on this command.
We'll see some over the time, the rest are in the documentation
javac myClassName.java

16. The .java file is plain text
We use the file extension here.

17. When we run javac, the .class file is automatically created

18. Load, Verify, Execute java myClassName
These three phases take place all at once
To execute the class file, we type:
There are, of course, many variations on this command.
We'll see some over the time, the rest are in the documentation
java myClassName

19. We don't use the file extension here!

20. Saving your output to a text file
We would like to save our output to a file
We do this from a DOS window using the "redirect" command:
java myClassName > myClassNameOUT.txt
The “redirect” symbol is the “greater than” symbol on your keyboard – usually located above the period (“.”)

21. Using your output file Or
You can use the DOS command "type" to see what is in your file
Note – You can not print directly from DOS in the labs Or
You can open WordPad, notepad, or other word processor and read the file directly
Using this method, you can also print your file.